void exercise_01();

void exercise_02a();

void exercise_02b();

void exercise_03();

void exercise_04();

void exercise_05();

void exercise_06();

void exercise_07a();

void exercise_07b();

void exercise_08a();

void exercise_08b();

void exercise_08c();

void exercise_08d();

void exercise_09();

void exercise_10();

void exercise_11();

long exercise_12(int value);

void exercise_13();

void exercise_14();
